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|
Longwall retreat of gate road pillars
| Author: | Listak, Jeffrey M. |
|---|---|
| Additional Authors: | Bauer, Eric R. |
| Year: | 1993 |
| Document Type: | BMRA |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.23:7444 |
| Series: | Report of investigations / Bureau of Mines ; |
| Report Number: | 9444 |
| Subjects: | Pillaring (Mining) |
| Longwall mining--Pennsylvania | |
| Ground control (Mining)--Pennsylvania | |
| Gate roads (Mining)--Pennsylvania | |
| Links: | no.9444 1993 |
| https://hdl.handle.net/2027/mdp.39015077558867 |
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